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authorThomas Zimmermann <tzimmermann@suse.de>2019-07-03 09:58:34 +0200
committerGerd Hoffmann <kraxel@redhat.com>2019-08-01 15:01:42 +0200
commit58540594570778fd149cd8c9b2bff61f2cefa8c9 (patch)
tree3565871b193869c0c131f6a6c89a2039ff2887e2
parent01b947afaa940327e7adf57070a4bf3d0bed9810 (diff)
drm/bochs: Use shadow buffer for bochs framebuffer console
The bochs driver (and virtual hardware) requires buffer objects to reside in video ram to display them to the screen. So it can not display the framebuffer console because the respective buffer object is permanently pinned in system memory. Using a shadow buffer for the console solves this problem. The console emulation will pin the buffer object only during updates from the shadow buffer. Otherwise, the bochs driver can freely relocated the buffer between system memory and video ram. v2: * select shadow FB via struct drm_mode_config.prefer_shadow_fbdev Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Noralf Trønnes <noralf@tronnes.org> Link: https://patchwork.freedesktop.org/patch/315833/ Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
-rw-r--r--drivers/gpu/drm/bochs/bochs_kms.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
index bc19dbd531ef..359030d5d818 100644
--- a/drivers/gpu/drm/bochs/bochs_kms.c
+++ b/drivers/gpu/drm/bochs/bochs_kms.c
@@ -191,6 +191,7 @@ int bochs_kms_init(struct bochs_device *bochs)
bochs->dev->mode_config.fb_base = bochs->fb_base;
bochs->dev->mode_config.preferred_depth = 24;
bochs->dev->mode_config.prefer_shadow = 0;
+ bochs->dev->mode_config.prefer_shadow_fbdev = 1;
bochs->dev->mode_config.quirk_addfb_prefer_host_byte_order = true;
bochs->dev->mode_config.funcs = &bochs_mode_funcs;